could tittup
Regular verb: tittup - tittuped- tittuped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could tittup
you could tittup
he could tittup
we could tittup
you could tittup
they could tittup 	I could be tittuping
you could be tittuping
he could be tittuping
we could be tittuping
you could be tittuping
they could be tittuping	I could have tittuped
you could have tittuped
he could have tittuped
we could have tittuped
you could have tittuped
they could have tittuped	I could have been tittuping
you could have been tittuping
he could have been tittuping
we could have been tittuping
you could have been tittuping
they could have been tittuping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't tittup
you couldn't tittup
he couldn't tittup
we couldn't tittup
you couldn't tittup
they couldn't tittup 	I couldn't be tittuping
you couldn't be tittuping
he couldn't be tittuping
we couldn't be tittuping
you couldn't be tittuping
they couldn't be tittuping	I couldn't have tittuped
you couldn't have tittuped
he couldn't have tittuped
we couldn't have tittuped
you couldn't have tittuped
they couldn't have tittuped	I couldn't have been tittuping
you couldn't have been tittuping
he couldn't have been tittuping
we couldn't have been tittuping
you couldn't have been tittuping
they couldn't have been tittuping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I tittup?
could you tittup?
could he tittup?
could we tittup?
could you tittup?
could they tittup? 	could I be tittuping?
could you be tittuping?
could he be tittuping?
could we be tittuping?
could you be tittuping?
could they be tittuping? 	could I have tittuped?
could you have tittuped?
could he have tittuped?
could we have tittuped?
could you have tittuped?
could they have tittuped? 	could I have been tittuping?
could you have been tittuping?
could he have been tittuping?
could we have been tittuping?
could you have been tittuping?
could they have been tittuping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I tittup?
couldn't you tittup?
couldn't he tittup?
couldn't we tittup?
couldn't you tittup?
couldn't they tittup? 	couldn't I be tittuping?
couldn't you be tittuping?
couldn't he be tittuping?
couldn't we be tittuping?
couldn't you be tittuping?
couldn't they be tittuping? 	couldn't I have tittuped?
couldn't you have tittuped?
couldn't he have tittuped?
couldn't we have tittuped?
couldn't you have tittuped?
couldn't they have tittuped? 	couldn't I have been tittuping?
couldn't you have been tittuping?
couldn't he have been tittuping?
couldn't we have been tittuping?
couldn't you have been tittuping?
couldn't they have been tittuping?